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AgGaSe2 crystals
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AgGaSe2 crystals

Main features

 

  • Reasonable transparency within ~0,7-18 μm range
  • 1,83 eV band gap results in no observation of two-photon absorption above ~1355 nm wavelength
  • Typical Figure-of-Merit is ~70 pm2/V2, which is roughly six times higher than counterpart Silver Thiogallate (AgGaS2, AGS)
  • Desired orientation as well as coatings are available under demand, which is an advantage over Gallium Selenide (GaSe) crystal with similar transparency region

 

Application examples

 

  • Difference-frequency generation of ultrashort pulses in the mid-IR range via tandem with synchronously-pumped optical parametric oscillator (SPOPO) from 5 μm to 18 μm
  • Optical parametric oscillators (OPOs) pumped by 1-3 μm radiation
  • Second harmonic and sum frequency generation (SFG) in the mid-IR range
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  • Description
  • Properties

Silver gallium selenide (AgGaSe2, AGSe) is an optically negative uniaxial crystal with a reasonable transmittance over roughly 0,7 μm - 18 μm region. AGSe crystals have proven to be used in nonlinear parametric downconversion (difference frequency generation, DGF) in the Mid-IR range by tandem with commercially available synchronously-pumped optical parametric oscillators (SPOPOs) in the femtosecond and picosecond regime [1]. AGSe crystal has one of the highest figure of merits (~70 pm2/V2) from commercially available mid-IR nonlinear crystals, which is six times larger than counterpart AGS. For some particular reasons AGSe is also a better choice over other mid-IR crystals. For example, even though GaSe has higher nonlinearity and comparable transparency region, AGSe has lower spatial walk-off and availability to be processed for particular application (growth and cut direction, dielectric thin-film coatings). ZGP has higher figure of merit, but its transparency region (~2-12 μm) is no match to AGSe. 

Physical and optical properties
Chemical formula AgGaSe2
Crystal structure Tetragonal, 42m
Lattice parameters a = 5,9920 Å, c = 10,8803 Å
Optical symmetry Negative uniaxial (no >ne, λ < 804 nm ne > no)
Density 5,7 g/cm3
Mohs hardness 3-3,5
Transparency range @"0" transmittance level 0,71 - 19 μm 
Sellmeier equations @T=293 K (λ in μm) no2=6,8507 + 0,4297/(λ2 - 0,1584) - 0,00125 λ2;

ne2 = 6,6792 + 0,4598/(λ2 - 0,2122) - 0,00126 λ2
Refractive indices @10,5 μm no = 2,5917, ne = 2,5585
Thermal conductivity @T = 293 K 1 (||c) Wm-1K-1, 1,1 (⊥c) Wm-1K-1
Laser induced damage threshold >10 MW/[email protected],6 μm, 150 ns
Order your item
Face dimensions Length Theta Phi Coatings Application SKU PRICE QUANTITY
5x5 mm
10 mm
52°
45°
Ultrashort pulse [email protected],7-2,7 μm -> ~5-18 μm, type I
15805
Request
5x5 mm
2 mm
52°
45°
Ultrashort pulse [email protected],7-2,7 μm -> ~5-18 μm, type I
15806
Request
5x5 mm
5 mm
52°
45°
Ultrashort pulse [email protected],7-2,7 μm -> ~5-18 μm, type I
15807
Request